Electrical switch



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I Afforgf' 2 Jan. 20, 1925.

Fatented dan. Z, i925.

n i r GEORGE VINTER AND ROBERT WINTER, DE T'JANCHESTER, ENG-LAND.

ELECTRICAL SWITCH.

Application led January 11, 1322.

To all fui/0m t may concern x Be it known that we, Geenen. ENTER andReenviar VINTER, subjects of the King of Great Britain and Ireland, andresidents of Manchester, in the county of Lancaster, England, haveinvented certain mprovements in Electrical Switches, of which theJfollowing is a speciiication.

hese improvements relate to electrical plug switches of that typecomprising a base plate, and a rotatable plug concentric with the baseplate which plug carries radial arms serving as contact pieces to comeagainst liXed contact pieces on the base plate to close the circuit whenthe plug carrying the pins which are the terminals of the lead andreturn wires is pushed into the socket.

The object of our present invention is to form a switch of the typeabove referred to, our invention consisting in the provision andparticular combination of partswhich will ensure that, when the plug isrotated in order to close the electric circuit, said plug shall besecured to the base plate and cannot be withdrawn until the plug isrotated in the reverse direction and the circuit opened by theseparating of the iXed and movable contacts within the switch body.

In carrying our improvements into effect we provide a switch comprisinga base plate, a movable socket and a loose plug member, the base platebearing contact pieces and the socket bearing radial blades to makecontact with said ieces and close the circuit when desired. uch partsare known. On the socket or in such a position as to be movabletherewith we fix a spring stop,hereinafter referred to as the lockingspring, which when the switch is in the off position engages the edge ofa fixed stop projecting Ytrom the base plate, such stop beinghereinafter referred to as the locking member. rThe plug has formed withit or iiXed thereon in addition to the two pins serving as terminals forthe lead and return wires a locking pin so formed that when the plug ispushed into position the three pins enter holes in the socket and thelocking pin pushes the locking spring back to allow radial movement ofthe socket, the locking spring passing behind the locking' member, theedge of the locking member entering a transverse slot in the locking pinto keep the parts in the closed circuit position by friction.

le will now fully describe a method of Serial No. 528,394.

carrying the invention into effect with reference to the accompanyingdrawings, in which Figs. l and 2 are front and side elevations of theplug,

Figs. 3 and 4 are similar views of the socket bearing the contact arms,

Figs. 5 and 6 are similar views of the base plate and socket, and Fig. 7is a sectional view o' the switch as a whole, the plug being shown inoutline and the switch being in the closed circuit7 position.

ln Figures l and 2, l is a plug of known type having secured to theinner Jrace thereot1 the locking pin 2 having l'orined therein thetransverse slot 3. et, 4 indicate pins, which maybe circular as shown,or of any cross section other than that of pin 2. They may be split asclearly shown in Figure 2. These pins et, 4t are the usual plug pins forthe lead and return wires.

ln Figures 3 and t, 5 is a socket, the inner tace of which is showninFig. 3, mounted on a spindle 6, bearing the contact arms 7 and havingfitted thereto, the curved plate spring 8 (the locking spring). Figures5, G and 7 show the socket 5 secured to the base plate 9 by means ofthe.' screwed spindle 6, and showing holes l0, il, 1l in the said socketadapted to receive the pins 2, et, 4 ot' the plug l, and also showingclearly in Figure 5, the relative position of these parts on the socketto the usual contact pieces l2 borne by the base plate 9, and thecontact arms ot socket in the open circuit position. The plate spring 8is shown in dotted lines in F igures 5 and G. lt will be seen that thecurved end of the latter normally comes against the edge of a lockinglmember' 13 secured to the base plate and prevents movement of the socket5.

When it is desired to rotate the socket so as to close the circuit, theplug l is pushed into position, pin 2 ei'itering hole l0, and split pins4i, 4s entering the holes ll, ll. The end of pin 2 therefore cornesagainst he locking spring 8 thus pushing it back as shown in sectionFigure 7, and out of contact with the locking member i3. The socket maynow be turned clockwise as viewed in Figure 5, the locking springl Spassing' behind the downwardly depeinling limb of the part 18, to bringthe contact arms .7 against the contact pieces l2 carried by the baseplate. The slot 3 in locking pin 2 allows oit' lll Qi" 1,523,57o

this movement, the downwardlydepending; end of locking member` 13entering Said slot" 3. The edge of the looking spring 8, hailing nowpassed-behind the locking member13,'VA presses against the rear face ofthe latter, this is, that face thereof which is the nearer to the baseplate, and by frictionmaintains the socket in the closed circuitposition. A helicalspringl Vvsurrounding the .spindle `6 and pressingthe vsocket and base platefap'a'rt.

` contact betweenithe the?, :then pin 2; and elfico-urs@ tlie'hole 10wherein it ftamayfbe arcuate or other 'shape in 'ross section and thepins 4., 4C and their corresponding fholes :11, Y1 1 .im th'e.fsocket oflanypross section different from that of pin 2." Again-the locking pin 2needV not be slot'- tecl but maybe formed with a foot or projection 'atright "angles thereto which foot, on the spring 8 beingpushed back bythe lockingpinrand theplug turned, would Vengage .the :rear edge ,oflthe downwardly 'dependingedge of .lockingmember 13.

lock-ingfpin '2 may serve as the earthassists this frictlona'l lockingspring, 8 on-y the. socket 5 .anclQth'e locking member 413 on the baseplate.` The.v socketandbaseplate are thus Ihelfcl intheir irdh.) in@relative positions, to keep,the1circuit closed,4 vllgiatyye elaimasfourinvention and de"- To f )pen` the ci1fcuit,: ythe plug 1 ,is turned sireto secure by VLett-ers Patent iszcounter-clockwise as VieWechnFi'gure.55.. Inanelectric switch, a base plate'ha'ving thus disengaging. thecontacts 7 land 12,.,and 7`electni'cal` Acor'ita'ctsy mounted thereon,an 'anatcthe same time movingthe locking spring 8,'Y from behind` member.13 andy disengaging the slot 3 lofpin 2 Afrom the vedge of 4the. saicllloekinggmember. Ou the plug l .beingwvi'thl cliawm'the looking springresumes .its non. plate,i va cloyvnwardlyflependiiigggl mal: positionagainst the edge of.locki'1g. brack'eton y"the member 1 3, thuspreventing vany radial. move. mentAk of socket 5 until the .plug rwithits-spe?. cialslottecl pin 2.is Aagain inserted.) A awoolen case "orcovershownin dotted linesatjl, lFigure .7, .isI Aprovided `toy prey'entrotation of the socket by the fingers, .and the base and-socketmay be.formed of 'anygsuitablematerial yor combination of zma'terialsf'.heplugzmay be of fwood, asfisusual," and.' the metallparts also of..the :usual metals.

We do not confine. ourselxes to the partic-V ular 'arrangement .shown of"lockingllmem ber 1B, locking springi8,andlocking ping." The. part 81naybe fon instance a straight, not curved, plate1of rspring'steel o-rothifwise, anclwof. suitable thickness... Also las a,ireater-precaution. .against tampering. the switch, lthe locking member'.13 na'y' bj. In rstim'ony Wh'e'reof-"Wehaehereuntoprovfiled.Withtwoormoredownwardlyeset "'our. lhns.- Y V j pendinglmembers, with a.. correspo'nfling; r GEORGE-WNTER; number of slots '3inthe locking Furd R'BTI VINTER.'

cal'` contact blades 'on the 'socket' to make coni tact. ,y'vith theelectrical contacts 'on the base borne the "socket and "opposite to 'an'or1" tice therein and.\norn'i'allyjiesting. against the the switch is intheoifposition, `a plug bear# tagt with the-'contact Jblades borne"b'y'tl1`e sockt".tlirougli orifices in the latter, anclfa the ys'ock"e't"'to 'pres-s, back tlie plateY` spring borne biylth'e -latter'andrlallow the' socket'tto be; .rtate'cl Jwhen the plug isinserteclftherein, theV 4short of the 'Lshaped "braaketenteiq` ec'lgehof'the bracketl 'on tl'iebas'e "plate when.

looking; pin' having a slot.' therein vborne y'by ing ;the slot lin theVpin 'during'suchrotation gularly 'movable' socket rnmintefd a'on saidbase. plate'igmd v'Con-centri@y therewith, 'electri-e ing terminal pins'which make electrical vcon-

